#pragma once
#include <iostream>
#include <assert.h>
using namespace std;

class Date
{
public:
	void Print();
	Date(int year = 1, int month = 1, int day = 1);
	bool operator==(const Date& d);
	bool operator!=(const Date& d);
	bool operator>=(const Date& d);
	bool operator>(const Date& d);
	bool operator<(const Date& d);
	bool operator<=(const Date& d);

	Date& operator+(int day);
	Date& operator+=(int day);
	Date& operator-(int day);
	Date& operator-=(int day);

	Date operator++(int);
	Date operator++();
	Date operator--(int);
	Date operator--();

	int operator-(const Date& d) const;

	int GetMonthDay(int year, int month) const
	{
		assert(month > 0 && month < 13);
		static int montharr[] = { -1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
		if (month == 2 && (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
		{
			return 29;
		}
		return montharr[month];
	}
private:
	int _year;
	int _month;
	int _day;
};